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Can you explain more

It is not explained what kind of list it is.
encase it is a java list u can use simply

Collections.sort(list);

Note: object must have implemented Comparable interface. if not then we can use

Collections.sort(list,comparator);

import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

/**
 * Created by akhil on 12/13/2015.
 */
public class SortStringList {

    public static void sortString(List<String> lst) {

        Set<String> st = new TreeSet<String>(lst);

        for (String s : st)
            System.out.print(s);


    }


    public static void main(String arg[]) {

        List<String> lst = new LinkedList<String>();

        lst.add("akhil");
        lst.add("kumar");
        lst.add("gupta");
        lst.add("nidhi");
        lst.add("mahajan");
        lst.add("cinema");

        sortString(lst);

    }
}

import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

/**
 * Created by akhil on 12/13/2015.
 */
public class SortStringList {

    public static void sortString(List<String> lst) {

        Set<String> st = new TreeSet<String>(lst);

        for (String s : st)
            System.out.print(s);


    }


    public static void main(String arg[]) {

        List<String> lst = new LinkedList<String>();

        lst.add("akhil");
        lst.add("kumar");
        lst.add("gupta");
        lst.add("nidhi");
        lst.add("mahajan");
        lst.add("cinema");

        sortString(lst);

    }
}

import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

/**
 * Created by akhil on 12/13/2015.
 */
public class SortStringList {

    public static void sortString(List<String> lst) {

        Set<String> st = new TreeSet<String>(lst);

        for (String s : st)
            System.out.print(s);


    }


    public static void main(String arg[]) {

        List<String> lst = new LinkedList<String>();

        lst.add("akhil");
        lst.add("kumar");
        lst.add("gupta");
        lst.add("nidhi");
        lst.add("mahajan");
        lst.add("cinema");

        sortString(lst);

    }
}